import time as t


class MyTimer:
    def __init__(self):
        self.unit = ['年', '月', '天', '小时', '分钟', '秒']
        self.borrow = [0, 12, 31, 24, 60, 60]
        self.prompt = '未开始计时!'
        self.lasted = []
        self.begin = 0
        self.end = 0

    def __str__(self):
        return self.prompt

    __rept__ = __str__

    def __add__(self, other):
        prompt = '总共运行了'
        result = []
        for index in range(6):
            result.append(self.lasted[index] + other.lasted[index])
            if result[index]:
                prompt += (str(result[index]) + self.unit[index])
        return prompt

    # 开始计时
    def start(self):
        self.begin = t.localtime()
        self.prompt = '提示,请先调用stop()停止计时'
        print('计时开始...')

    # 停止计时
    def stop(self):
        if not self.begin:
            print('提示:请先调用start()进行计时')
        else:
            self.end = t.localtime()
            # self.

    # 内部方法,计算运行时间
    def _calc(self):
        self.lasted = []
        self.prompt = '总共运行了'
        for index in range(6):
            temp = self.end[index] - self.begin[index]

            # 低位不够减,需向高位借
            if temp < 0:
                # 测试高位是否有的借,没的话再向高位借
                i = 1
                while self.lasted[index - i] < 1:
                    self.lasted[index - i] += self.borrow[index - i] - 1
                    self.lasted[index - i - 1] -= 1
                    i += 1
                self.lasted.append(self.borrow[index] + temp)
                self.lasted.append(temp)
            else:
                self.lasted.append(temp)
         #由于高位随时会被借位,所以打印放最后

        for index in range(6):
            if self.lasted[index]:
                self.prompt += str(self.lasted[index]) + self.unit[index]
        # 为下一轮计时初始化变量
        self.begin = 0
        self.end = 0
